PCB Suppliers, Continental Circuits (PHX) generally pin gauges holes to determine the actual size. Our SOP has been to use a pin .001 smaller than the bottom of the tolerance. That is, for a .043 +/-.003 hole we would use a .039 pin. If this passes through with normal pressure, we say the hole is at least .040 and is in tolerance. I can't find this technique documented anywhere and have a customer who disagrees. They use the same size pin as the bottom of the tolerance. How do you measure holes? I could use some support for our method. Rich Olsen ------------------------------------------------------------------ Richard Olsen Telephone (602)-232-9154 Continental Circuits Corp. Main (602)-268-3461 3502 East Roeser Road Fax (602)-268-0208 Phoenix Arizona Pager (602)-310-6245 85040-2905 Internet [log in to unmask] USA I make circuit boards,what do you do? ------------------------------------------------------------------